PSLE
Eva and Cindy folded paper balls over two days. On Friday, Eva folded 9 paper balls more than Cindy. On Saturday, Eva folded another 17 paper balls and Cindy folded another 6. At the end of the two days, Eva made ⁵₈ of the total number of balls. What was the number of paper balls that Cindy folded?

	Eva	Cindy	Difference
Before	1 u + 9	1 u	9
Change	+ 17	+ 6
After	1 u + 26	1 u + 6	20
Comparing between Eva and Cindy in the end	5 p	3 p	2 p

Difference between the number of paper balls that Eva and Cindy folded in the end is repeated.

Difference between the number of paper balls that Eva and Cindy folded in the end
= 5 p - 3 p
= 2 p

Difference between the number of paper balls that Eva and Cindy folded in the end
= (1 u + 26) - (1 u + 6)
= 1 u + 26 - 1 u - 6
= 26 - 6
= 20

2 p = 20

1 p = 20 ÷ 2 = 10

Number of paper balls that Cindy folded
= 3 p
= 3 x 10
= 30

Answer(s): 30